Hoisting apparatus for dipper-buckets.



A. W. ROBINSON. HOISTI NG APPARATUS FOR DIPPER BUCKETS.

APPLICATION FILED FEE.19,1912.

Patented Dec. 16, 1913.

ARTHUR W. ROBINSON, OF MONTREAL, QUEBEC, CANADA.

HOISTING APPARATUS FOR DIPPER-BUCKETS.

Specification of Letters Patent.

Patented Dec. 16, 1913.

Application filed February 19, 1912. Serial No. 678,690.

To all whom it may concern.

Be it known that I, ARTHUR \V. RoBINsoN, a citizen of the Dominion of Canada, and a resident of the city of Montreal, county of Hochelaga, Province of Quebec, Dominion of Canada, have invented certain new and useful Improvements in Hoisting Apparatus for Dipper-Buckets, of which the following is a full, clear, and exact description.

The invention refers, generally stated, to that class of dredge or excavating machinery, in which asingle dipper is employed and of which familiar examples are the steam shovel and the dipper dredge.

It relates more particularly to the manner of hoisting the dipper and the arrangement of the sheaves for guiding the hoisting ropes or chains. This invention is a-further development of that which is set forth in the United States Letters Patent granted to me September 9, 1902, No. 708,589, in which a similar arrangement of the hoisting ropes relative to the dipper is shown, but in my present invention the location and arrangement of the sheaves for supporting and guiding the ropes from the dipper to the hoisting drum are essentially different.

The object of this invention is to provide means whereby the hoisting line may be carried from the hoisting drum to its point of application to the dipper in a convenient manner, so as to permit a revolving movement of the boom, and also so as to retain certain advantages connected with the use of a solid dipper arm, and finally to simplify the parts and to conserve the space occupied by them.

Referring to the drawings. Figure 1 illustrates the inver '-on in side ele'vation, a portion only of the hull on which the machinery i mounted being shown; Fig. 2 illustrates a plan of the boom, sheaves and coacting parts; Fig. 3 illustrates a rear elevation, partly in section, of the lower sheaves supported on the boom, showing also the double sheave in the hold of the dredge and the hoisting ropes passing over them; Fig. 4 illustrates a front elevation of the dipper and the upper end of the boom, showing the two sheaves thereon and the hoisting ropes passing over them.

In the drawings, 1 represents the hull of the dredge, or other suitable support, such as a car, a platform, or equivalent structure, 2 the boom or swinging member on which the parts are mounted, 3 the dipper, 1 the dipper arm, 5, 5, the double'hoisting rope which is, or may be, composed of a single piece of rope or chain, the two ends of which are connected to the hoisting drum 6, the rope being engaged with the dipper 3 at about the middle of its length by being looped over an equalizing sheave 7 which is connected to the dipper, as shown.

8 represent the A frame, 9, 9, stay rods for the same and for the end of the boom respectively, 10 a pinion suitably revolved by the engine and which drives the drum in a manner well understood.

11, 11, are two sheaves at the upper end of the boom, which separate and guide the duplex hoist 5, 5. 12, 12, are two other sheaves at or near the inner end of the boom. 13 is another sheave suitably journaled in brackets or equivalent supports 14 which are located in the hold of the dredge or below the deck or platform of a car, or similar support for the apparatus, if it be other than a dredge. The sheave 13 is preferably, but not necessarily, made in the form of a single sheave with a double groove, one for each of the hoisting ropes 5, 5. Obviously two single sheaves suitably located would be the equivalent thereof, and from this sheave 13 the two ropes pass rearwardly to the drum 6, the surface of which is preferably provided with spiral grooves to receive the ropes as usual.

The boom 2 is mounted in any suitable manner upon a turn table 15 which is suitably supported by and turns upon a hollow trunnion 16, down through which the two parts of the duplex hoist pass on their way from the swinging sheaves 12 to the underlying fixed sheave 13.

It will be noted that the ropes 5, 5, on the top of the boom are spread sufiiciently apart to allow the dipper arm 4 to work freely between them. In this rcspcct the invention is similar to that shown in United States Patent, No. 708,589, above referred to, except that in the present case, the sheaves 11, 11, on the end of the boom are inside its members instead of outside and the ropes of the duplex hoist are preferably separated only so far as will suitably clear the dipper arm at. It will be particularly noted that the two sheaves 12, 12, at the inner end of the boom are arranged in a slightly inclined position, so that their upper arcs are substantially in line with duplex hoist and that they are in the plane the two ropes of the of the vertical portions of the hoisting ropes, 5, 5, which lead to the lower sheave l3 and that the vertical portions of the rope 5, 5, which extend from the sheaves 12, 12, to the sheave 13 are therefore equally disposed about the axis of revolution, so that perfect freedom of movement can be obtained with out interfering with the efficiency of the mechanism. It will be noted also that these vertical ropes do not connect with the sheave 13 in truly parallel planes, but this is of no moment because the deflection is a very small angle and is easily provided for by the flanges of the sheaves. For all practical purposes the construction is substantially the same as though the ropes were parallel.

By my improved construction and arrangement the sheave 13 and the drum and co-acting parts are all below the level of the deck or platforin'ot' the supporting structure, thus leaving a space free thereon for other purposes, such as sluing machinery for the boom, warping apparatus, etc.

It will be obvious to those who are fa miliar with such matters that modifications may be made in the details of construction shown by me without departing from the essentials of the invention. it do not, therefore, limit myself to such details.

l claim:

A hoisting apparatus of the class stated,

embodying a turn table, a boom supported thereon a double hoisting rope, equalizing means near the dipper .in operative connec- -ward arc of which is in substantially the same vertical plane as the axis of rotation of the boom, and a winding drum in rear of said last named sheave, all of said parts being suitably supported upon and maintained in proper relation to each other by a suitable supporting structure, the two runs of the hoisting rope passing from the separating means on the free end of the boom over the inclined sheaves near its lower end thence under the sheave below the turn table, and thence to the winding drum to which they are secured.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ARTHUR W. ROBINSON.

Witnesses:

E. M. Conner, D. S. CHRISTIE. 

